The Big Lebowski Phenomenon derives its name from the eponymousCoen Brothersfilm. Many exited the theatre, having seen it for the first time, feeling distinctly underwhelmed; the critical response tended to match this feeling. However, on repeated viewings, especially on video, these same masses have noted that it mysteriously seems to get better and better. The experience became widespread enough that the film's title was forever attached to the phenonmenon.

Not that while the BLP is often used in reference to cinema, its applicable uses extend far beyond film stock. Also note that the BLP is a peculiarly individual occurence.